Live · updated daily from USGS
Swimmable water near you
2,135 USGS sensors are reporting a live water temperature right now, the newest reading from August 22, 2026 (12 hrs ago).
- Cold · below 60°F · 384
- Cool · 60–69°F · 607
- Comfortable · 70–86°F · 929
- Warm · above 86°F · 215
- You
A map of the United States with one coloured dot per USGS sensor reporting a live water temperature. The readings are listed below.
Nearest live readings
The closest USGS sensors currently reporting a water temperature, nearest first.
- 78°F13 mi1 day ago
- 78°F13 mi1 day ago
- STONY BROOK RESERVOIR AT DAM NEAR WALTHAM, MAUSGS gauge · Massachusetts · 0 ft³/s78°F16 mi1 day ago
- STONY BROOK RES., UNNAMED TRIB 1, NEAR WESTON, MAUSGS gauge · Massachusetts · 0 ft³/s61°F16 mi1 day ago
- STONY BROOK AT RT 20 AT WALTHAM, MAUSGS gauge · Massachusetts · 20 ft³/s75°F16 mi1 day ago
- STONY BROOK, UNNAMED TRIBUTARY 1, NEAR WALTHAM, MAUSGS gauge · Massachusetts · 0 ft³/s60°F17 mi1 day ago
- 72°F17 mi1 day ago
- HOBBS BK BELOW CAMBRIDGE RES NR KENDALL GREEN, MAUSGS gauge · Massachusetts · 18 ft³/s78°F18 mi1 day ago
Nearest swimmable spots
Rated, photographed water destinations within 25 miles — pair one with the nearest sensor reading above before you go.
4.5(473)Neponset River Reservation
Wildlife habitat with parks, playgrounds & trails, plus bird-watching, fishing, hiking & kayaking.
4.4 mi from your location
4.2(154)Tenean Beach
Sandy spot features a playground, a boardwalk & various picnic areas with shade shelters & seating.
5.1 mi from your location
4.7(534)Brookline Reservoir Park
A walking/jogging track surrounds a reservoir anchoring this 32-acre recreation & fishing area.
9.4 mi from your location
4.3(26)Minot Beach
Modest sandy beach in a residential area featuring seasonal lifeguards & several large rocks.
13 mi from your location
4.5(55)The Park at River's Edge
Waterfront, landscaped green space featuring river views, lawns, paths & the Tufts crew boathouse.
13 mi from your location
About this map
Every pin is a live reading from a USGS real-time monitoring station, captured in a daily snapshot. Colours follow the site’s cold-water-safety thresholds and describe the water at that one sensor — usually a river or stream gauge, not a swim beach — so treat them as a guide to what the water is doing nearby, not a verdict on a specific spot. Readings are provisional and can be revised by the USGS. Your location only sorts this page: the coordinates appear in the address bar (rounded to about a mile) and are not saved to an account or our database.
Conditions are for general information only and can change quickly. Always judge the water in person and follow posted advisories and local guidance before swimming or paddling.

